QJ 334 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 334 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
41.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
170 mm
Bore diameter tolerance
-0.018mm to 0
Outside diameter
360 mm
Outside diameter tolerance
-0.028mm to 0
Width
72 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
186 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
237 mm
Outer Ring Dimensions
Shoulder diameter outer ring
293 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
147375 lbf
Radial static load rating
234000 lbf
Limiting speed
3.2 X 1000 rpm
Lubrication
Lubricated
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Brass
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
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QJ 334 N2MA Bearing Product Overview & Core Advantages
The QJ 334 N2MA is a four-point contact ball bearing designed for exceptional performance in demanding applications. This single-row bearing excels at simultaneously handling combined radial loads and axial loads from both directions, making it an ideal solution for compact arrangements requiring high rigidity and precision. Its P6 tolerance class (ABEC-3) ensures reliable operation and accurate rotational performance, while the brass cage contributes to stable high-speed capability.
QJ 334 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates two opposing grooves and lubrication holes in the outer ring for effective re-lubrication |
| MA | Specifies the bearing is filled with a specific high-performance grease suitable for the operating temperature range |
QJ 334 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The optimized raceway geometry enables the bearing to accommodate significant axial loads in both directions while maintaining excellent radial load capacity, effectively replacing two single-row angular contact bearings in many applications.
- High Rigidity & Precision: Manufactured to P6 tolerance class with precise dimensional control, this bearing provides stable rotational accuracy and minimal deflection under load.
- Enhanced Lubrication System: The N2 designation provides external lubrication grooves and holes, allowing for effective re-lubrication to extend service life and maintain performance in continuous operation.
- Optimized Cage Design: The brass cage ensures reliable operation at the specified limiting speed of 3,200 rpm, providing excellent mechanical strength and wear resistance.
- Superior Load Ratings: With a dynamic load rating of 147,375 lbf and static load rating of 234,000 lbf, this bearing delivers exceptional durability and long service life in demanding conditions.
QJ 334 N2MA Bearing Typical Application Areas
- Industrial Gearboxes and power transmission systems
- Machine Tool Spindles and rotating assemblies
- Large Industrial Pumps and compressors
- Material Handling Equipment including crane hooks and slewing rings
- Wind Turbine pitch control mechanisms
- Construction Machinery rotating platforms and joints
